Intelligence agencies still examining reports that researchers at a Chinese virology laboratory in Wuhan were seriously ill in 2019 a month before the first Covid-19 cases were reported.
However, Chinese scientists and officials have consistently rejected the lab leak hypothesis, saying the virus could have been circulating in other regions before it hit Wuhan and might have even entered China through imported frozen food shipments or wildlife trading.
A spokesman for China's foreign ministry, Wang Wenbin, declined to comment directly on whether China would release the records of the nine but firmly denied that the laboratory was linked to the outbreak of Covid-19.